different between terbian vs tercian

English

terbium +? -ian

terbian (comparative more terbian, superlative most terbian)

tercian (plural tercians)

Alternative spelling of tertian (“An English measure of capacity for liquids”)

Certain, Cretian, ant rice, anticer, cantier, ceratin, certain, citrean, creatin, crinate, nacrite, tacrine

tercian

Second-person plural (ustedes) present indicative form of terciar.
Third-person plural (ellos, ellas, also used with ustedes^?) present indicative form of terciar.

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